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Carrie Underwood and her husband, NHL player Mike Fisher, have an adorable habit of sharing a ton of photos [2] of their son, Isaiah, on social media, and their latest post might be the little guy's cutest moment yet. On Sunday, Mike uploaded a video to Instagram [3] of Isaiah cooling off in a kiddie pool, and the end result is both hilarious and adorable. Dressed in a tiny green t-shirt and gray shorts, the 1-year-old sizes up the pool before deciding to leap into it face first. World's best belly flop or what?! Both Isaiah and his dad can't stop laughing, which will melt your heart faster than the insanely hot Summer sun ever could. Watch it above!